Propagation of UHF radio waves in limestone room and pillar mines. Summary report.
Washington, DC: U.S. Department of the Interior, Bureau of Mines, Contract J0377065, Contract J0387217, 1979 Jan; :1-43
This report presents a mathematical model for the propagation of UHF radio waves in the large cross section tunnels of a room-and-pillar limestone mine and describes the analysis of a small amount of propagation data obtained. The model and analysis is based on the waveguide mode theory, developed earlier for the transmission of UHF waves in coal mine tunnels, with allowance for propagation losses due to refraction into the tunnel walls. Propagation around corners and through pillars is also examined based on a ray theory approach together with the beneficial effects of placing reflectors at intersections to significantly reduce corner losses. The theory is found to be in fair agreement with the data; however, additional in- mine measurements are needed to provide a more conclusive test of the model.
Models; Mining-industry; Mining-equipment; Underground-mining; Room-and-pillar-mining; Radio-waves; Radio Propagation-UHF; Tunnels; Tunnel Communications; Mines-Radio Communication; Mine Communication-Wireless; Mines-Limestone; Coal
CP; Final Contract Report
NTIS Accession No.
OFR 27-82; Contract-J0377065; Contract-J0387217
Washington, DC: U.S. Department of the Interior, Bureau of Mines, Contract J0377065, Contract J0387217
Arthur D. Little, Inc.